EP0140502A1 - Rauchanzeigegerät - Google Patents

Rauchanzeigegerät Download PDF

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Publication number
EP0140502A1
EP0140502A1 EP84305512A EP84305512A EP0140502A1 EP 0140502 A1 EP0140502 A1 EP 0140502A1 EP 84305512 A EP84305512 A EP 84305512A EP 84305512 A EP84305512 A EP 84305512A EP 0140502 A1 EP0140502 A1 EP 0140502A1
Authority
EP
European Patent Office
Prior art keywords
light
chamber
stage
sensing apparatus
gain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84305512A
Other languages
English (en)
French (fr)
Other versions
EP0140502B1 (de
Inventor
Martin Terence Cole
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0140502A1 publication Critical patent/EP0140502A1/de
Application granted granted Critical
Publication of EP0140502B1 publication Critical patent/EP0140502B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • This invention relates to a device for the detection of smoke by light scatter techniques and particularly to a light detection means.
  • Devices for the detection of smoke by light scatter techniques. Such devices incorporate a light source configured to irradiate a volume of air provided in a sampling region in which smoke particles may be suspended. Light scattered off said particles is collected on a light detector means. The amplitude of the signal produced from said light detector is an indication of the quantity of smoke suspended in the air.
  • Particularly sensitive versions of such smoke detectors are also capable of monitoring air pollution.
  • Such high sensitivity enables detection of fires at the earliest possible (incipient) stage, whereby fires may be controlled ' with portable extinguishers by local personnel before smoke levels become dangerous to life.
  • Such detectors require a sensitivity as high as 20 micrograms per cubic metre for woodsmoke, equivalent to a visual range of 40 km.
  • the light source has included a Xenon flashtube and the light detector has been a photomultiplier tube, while both devices are mounted in conjunction with a sampling chamber through which samples of airborne smoke are passed.
  • a prime objective of the present invention is to provide an improved smoke detector in which the disadvantages inherent with prior art devices are at least substantially overcome.
  • the photomultiplier tube be replaced by an extremely sensitive solid-state light detector.
  • the present invention is directed to the use of solid-state detection technology which was hitherto considered impossible at room temperature and at reasonable cost.
  • the smoke detector according to the present invention comprises a sampling chamber which is internally a round tube, containing a series of devices to absorb light reflected off its internal walls. Air flow through the chamber is achieved by means of two coupling tubes, mounted at right-angles to the chamber. Between the coupling tubes is a sealed reflector and window for a Xenon flash tube as described in my co-pending Australian application No. PG0822/83, filed 12th August, 1983, to irradiate the particles within the chamber. At one end of the chamber is an extremely sensitive light detector, while at the opposite end is an axial-light absorber as described in my co-pending Australian application No. PG0821/83, filed 12th August, 1983. The chamber is airtight except for the coupling tubes. Within one coupling tube is an electronic air flow sensor, air flow being achieved by means of an external fan. Housed beside the chamber is the necessary electronics circuit boards.
  • the sampling chamber is particularly suited for use with the sampling device or point disclosed in my co-pending Australian Application No. PG0116/83 filed 4th July, 1983.
  • Jig fabrication of components is thereby dispensed with leading to greater dimensional accuracy and repeatability in production resulting in improved quality control. Furthermore simple assembly provides for simplified servicing.
  • the detector of the present invention is of long life solid-state design with the exception of the Xenon flashtube.
  • a novel focusing reflector designed to accommodate the unusual shape of the Xenon flash tube is disclosed. This improved light source with reduced flash energy will extend the maintenance period beyond two years under continuous operation.
  • an improved light absorber with sampling chamber as disclosed in my abovementioned co-pending application allows significant chamber length reduction to permit rack mounting of the detector in restricted spaces such as telephone exchanges and other equipment rooms.
  • the detector of the present invention can be operated from an unregulated 24 volt D.C. supply which could include standby batteries having a supply tolerance in the range of 20-28 volts D.C. in conformity with most conventional fire alarm systems.
  • the present invention provides in one aspect a PIN photodiode cell responsive to low levels of light connected to an impedance matching buffer stage, a gain controlled amplifier stage and an output amplifier stage; a gain control network controlled by a temperature sensor for receiving an amplified signal from said output stage the gain being adjusted to compensate for temperature dependence of the photodiode signal.
  • the solid-state photocell is a PIN photodiode cell adapted to be operated in a zero bias photovoltaic mode.
  • the detector is coupled with a preamplifier as defined of extremely low noise and high stability over a wide temperature range.
  • the PIN photodiode cell operating in said zero-bias photovoltaic mode exhibits variable non linear sensitivity to low light levels at varying temperature levels.
  • the output of the cell must be accurately calibrated over an operating temperature range of -20 to 50°C.
  • the temperature sensor and photodiode are maintained in an equivalent thermal situation or in thermal contact such that any temperature difference between the two is minimal.
  • the output from the combination of said temperature sensor and gain control network is non-linear in inverse proportion to the non linearity of the photodiode cell whereby temperature dependence of said cell is substantially eliminated.
  • a power supply filter network to prevent or restrict the injection of noise into any stage of the circuit. Electrical connections for the signal, supply and ground are made using shielded cable.
  • the detector includes a sampling chamber 70 including a series of irises 21, 22 to absorb and dissipate light reflected off the walls.
  • Coupling tubes 50 are provided to circulate ambient air from an area under fire surveillance into the chamber 70 across region 72 which is subjected to light from an Xenon flash tube in housing 60. Air flow is achieved by a fan (not shown).
  • the length of the air sampling chamber is critical to prevent incidental light being detected and the provision of a novel light absorber 10 enabled a considerable shortening of the tube.
  • the solid-state cell 1 is preferably a PIN photodiode responsive to low light levels and presenting a small signal to an impedance-matching buffer stage 2 connected to a gain-controlled amplifier stage 3 and an output amplifier stage 4.
  • the amplified signal is then fed back to a gain-control network 5 controlled by a temperature sensor 6.
  • the sensor and the PIN photodiode are maintained in close thermal contact such that temperature difference between the two is minimal under variable operating conditions.
  • the gain of the gain controlled amplifier stage 3 is adjusted to compensate for the temperature dependence of the small signal from PIN photodiode 1.
  • the output of the temperature sensor and the gain control network is non linear in inverse proportion with the non-linearity of the PIN photodiode cell such that temperature dependence of the cell signal is substantially eliminated.
  • the solid-state detector cell 1 must be small to minimize the capacitance which could otherwise result in reduced sensitivity to the flash rise time of about 1 microsecond from the flash tube. As a result the photon or light beam capture area is small compared with a conventional photomultiplier tube. Therefore a focusing lens 17 is provided with associated mounting hardware as shown in Figure 3.
  • the preamplifier circuit is encapsulated in epoxy 15, the circuit being constructed on a printed circuit board mounted against the base 9.
  • a detector attachment 16 is provided.
  • the container 10 also houses the lens assembly 17.
  • the preamplifier, detector cell optics and housing become a self contained and separately tested plug-in module connected by means of shielded cable 8.
  • the container 10 includes a base 9 tightly fitted to the cylinder section.
  • the flange 11 supporting the lens is a sliding fit in the cylinder section at the other end and retained by a grub screw 12.
  • the lens flange includes a mounting 14 for a lens assembly 17 and a sealing 0-ring mounted in groove 13. The use of the sealing ring allows the chamber to be sealed so that it can operate at other than atmospheric pressure.
  • the lens mounting arrangement facilitates removal of the lens or detector assembly to allow easy access to the sampling chamber for servicing purposes.
  • the PIN photodiode cell is operated in a zero-bias photovoltaic mode which suffers several disadvantages such as lower speed, lower stability, smaller dynamic range, higher temperature coefficient and reduced optical bandwidth when compared with normal photocurrent mode.
  • a major advantage of zero flicker noise is achievable which allows for maximum possible signal to noise ratio to be obtained.
  • the mentioned disadvantages can be compensated for as described herein.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Measurement Of Radiation (AREA)
  • Amplifiers (AREA)
EP84305512A 1983-08-12 1984-08-13 Rauchanzeigegerät Expired EP0140502B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPG082083 1983-08-12
AU820/83 1983-08-12

Publications (2)

Publication Number Publication Date
EP0140502A1 true EP0140502A1 (de) 1985-05-08
EP0140502B1 EP0140502B1 (de) 1989-11-15

Family

ID=3770281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305512A Expired EP0140502B1 (de) 1983-08-12 1984-08-13 Rauchanzeigegerät

Country Status (9)

Country Link
US (1) US4665311A (de)
EP (1) EP0140502B1 (de)
JP (1) JPS60100022A (de)
KR (1) KR950002498B1 (de)
AT (1) ATE48044T1 (de)
AU (1) AU573243B2 (de)
CA (1) CA1252172A (de)
DE (1) DE3480500D1 (de)
NZ (1) NZ209184A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2596180A1 (fr) * 1986-03-18 1987-09-25 Hochiki Co Systeme de detection de fumees et analogues et detecteur correspondant
WO1988009024A1 (en) * 1987-05-06 1988-11-17 Diantek Ab Temperature compensated detector for sensing and/or measuring passing objects
GB2230853A (en) * 1989-03-23 1990-10-31 Nittan Co Ltd Photoelectric smoke sensor
WO1990016053A1 (en) * 1989-06-15 1990-12-27 Fire Fighting Enterprises (Uk) Limited Particle detectors
EP0418411A1 (de) * 1989-09-19 1991-03-27 Siemens Aktiengesellschaft Brandmeldeanlage mit einem Kombinationsmelder
EP0463795A1 (de) * 1990-06-23 1992-01-02 Kidde Fire Protection Limited Rauchpartikeldetektor
FR2723235A1 (fr) * 1994-07-29 1996-02-02 Lewiner Jacques Dispositifs de detection d'incendie comportant un capteur de correction
EP0987663A1 (de) * 1998-09-14 2000-03-22 Siemens Building Technologies AG Optischer Rauchmelder nach dem Extinktionsprinzip und Verfahren zur Kompensation von dessen Temperaturdrift

Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU577551B2 (en) * 1983-10-21 1988-09-29 Vision Systems Limited Improvements relating to smoke detection apparatus
JPH0820363B2 (ja) * 1985-11-29 1996-03-04 ジエント リミテイド 火災検知器
JPH02209029A (ja) * 1989-02-09 1990-08-20 Toshiba Corp 自動利得制御装置
JPH06511554A (ja) * 1991-10-14 1994-12-22 ビジョン　システムズ　インコーポレイティド 汚染度検出器用の測定室に関する改良
AU666881B2 (en) * 1991-10-14 1996-02-29 Vision Systems Limited Improvements relating to a sampling chamber for a pollution detector
GB2274333B (en) * 1993-01-07 1996-12-11 Hochiki Co Smoke detecting apparatus capable of detecting both smoke and fine particles
US5910854A (en) 1993-02-26 1999-06-08 Donnelly Corporation Electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films, and processes for making such solid films and devices
JPH06288917A (ja) * 1993-03-31 1994-10-18 Nohmi Bosai Ltd 煙式火災感知器
US5668663A (en) 1994-05-05 1997-09-16 Donnelly Corporation Electrochromic mirrors and devices
AUPN179995A0 (en) * 1995-03-17 1995-04-13 Vision Systems Limited Improvements relating to gas pollution detection equipment
US6891563B2 (en) 1996-05-22 2005-05-10 Donnelly Corporation Vehicular vision system
AUPN965896A0 (en) * 1996-05-03 1996-05-30 Vision Products Pty Ltd The detection of airborne pollutants
US5926098A (en) * 1996-10-24 1999-07-20 Pittway Corporation Aspirated detector
US5764149A (en) * 1996-10-29 1998-06-09 Mcdonnell Douglas Corporation Enhanced capabilities of smoke detectors
US5910751A (en) * 1997-02-14 1999-06-08 International Business Machines Corporation Circuit arrangement and method with temperature dependent signal swing
US6172613B1 (en) 1998-02-18 2001-01-09 Donnelly Corporation Rearview mirror assembly incorporating vehicle information display
US6124886A (en) 1997-08-25 2000-09-26 Donnelly Corporation Modular rearview mirror assembly
US8294975B2 (en) 1997-08-25 2012-10-23 Donnelly Corporation Automotive rearview mirror assembly
US6326613B1 (en) 1998-01-07 2001-12-04 Donnelly Corporation Vehicle interior mirror assembly adapted for containing a rain sensor
US8288711B2 (en) 1998-01-07 2012-10-16 Donnelly Corporation Interior rearview mirror system with forwardly-viewing camera and a control
US6445287B1 (en) 2000-02-28 2002-09-03 Donnelly Corporation Tire inflation assistance monitoring system
US6329925B1 (en) 1999-11-24 2001-12-11 Donnelly Corporation Rearview mirror assembly with added feature modular display
US6693517B2 (en) 2000-04-21 2004-02-17 Donnelly Corporation Vehicle mirror assembly communicating wirelessly with vehicle accessories and occupants
US6477464B2 (en) 2000-03-09 2002-11-05 Donnelly Corporation Complete mirror-based global-positioning system (GPS) navigation solution
AUPQ553800A0 (en) * 2000-02-10 2000-03-02 Cole, Martin Terence Improvements relating to smoke detectors particularily duct monitored smoke detectors
WO2001064481A2 (en) 2000-03-02 2001-09-07 Donnelly Corporation Video mirror systems incorporating an accessory module
US7167796B2 (en) 2000-03-09 2007-01-23 Donnelly Corporation Vehicle navigation system for use with a telematics system
US7370983B2 (en) 2000-03-02 2008-05-13 Donnelly Corporation Interior mirror assembly with display
WO2007053710A2 (en) 2005-11-01 2007-05-10 Donnelly Corporation Interior rearview mirror with display
US7581859B2 (en) 2005-09-14 2009-09-01 Donnelly Corp. Display device for exterior rearview mirror
AU2002251807A1 (en) 2001-01-23 2002-08-19 Donnelly Corporation Improved vehicular lighting system for a mirror assembly
US7255451B2 (en) 2002-09-20 2007-08-14 Donnelly Corporation Electro-optic mirror cell
US6918674B2 (en) 2002-05-03 2005-07-19 Donnelly Corporation Vehicle rearview mirror system
US7329013B2 (en) 2002-06-06 2008-02-12 Donnelly Corporation Interior rearview mirror system with compass
EP1514246A4 (de) 2002-06-06 2008-04-16 Donnelly Corp Innenrückspiegelsystem mit kompass
US7274501B2 (en) 2002-09-20 2007-09-25 Donnelly Corporation Mirror reflective element assembly
WO2004103772A2 (en) 2003-05-19 2004-12-02 Donnelly Corporation Mirror assembly for vehicle
US7310177B2 (en) 2002-09-20 2007-12-18 Donnelly Corporation Electro-optic reflective element assembly
US7446924B2 (en) 2003-10-02 2008-11-04 Donnelly Corporation Mirror reflective element assembly including electronic component
US7308341B2 (en) 2003-10-14 2007-12-11 Donnelly Corporation Vehicle communication system
CA2543467A1 (en) 2003-10-23 2005-05-12 Martin Terence Cole Improvement(s) related to particle monitors and method(s) therefor
US7626749B2 (en) 2005-05-16 2009-12-01 Donnelly Corporation Vehicle mirror assembly with indicia at reflective element
WO2008070324A2 (en) * 2006-10-25 2008-06-12 Placor, Inc. Methods and devices for monitoring platelet function
US7656302B2 (en) * 2006-11-20 2010-02-02 Honeywell International Inc. Sensing chamber with enhanced ambient atmospheric flow
US8154418B2 (en) 2008-03-31 2012-04-10 Magna Mirrors Of America, Inc. Interior rearview mirror system
US8907802B2 (en) 2012-04-29 2014-12-09 Valor Fire Safety, Llc Smoke detector with external sampling volume and ambient light rejection
US8947244B2 (en) 2012-04-29 2015-02-03 Valor Fire Safety, Llc Smoke detector utilizing broadband light, external sampling volume, and internally reflected light
US9140646B2 (en) 2012-04-29 2015-09-22 Valor Fire Safety, Llc Smoke detector with external sampling volume using two different wavelengths and ambient light detection for measurement correction
AU2014342621B2 (en) 2013-10-30 2019-07-18 Valor Fire Safety, Llc Smoke detector with external sampling volume and ambient light rejection
US11568730B2 (en) 2017-10-30 2023-01-31 Carrier Corporation Compensator in a detector device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231748A (en) * 1961-10-30 1966-01-25 Fyr Fyter Co Smoke detector
US3396387A (en) * 1962-07-24 1968-08-06 Kidde & Co Walter Supervised apparatus for detecting suspended matter in fluids
AT288208B (de) * 1967-04-21 1971-02-25 Pyrotector Inc Überwachungseinrichtung zur Anzeige des Ausfalles der Lichtquelle für lichtoptische Rauchmelder
CH621640A5 (de) * 1977-11-21 1981-02-13 Cerberus Ag
DE3146110A1 (de) * 1980-11-24 1982-06-16 Hekatron GmbH, 7811 Sulzburg "optischer rauchdetektor"
GB2095821A (en) * 1981-03-17 1982-10-06 Malinowski William J Self-calibrating smoke detector and method

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US3588535A (en) * 1967-08-22 1971-06-28 Westinghouse Electric Corp Control circuit with temperature compensation
US3480781A (en) * 1967-09-15 1969-11-25 Westinghouse Electric Corp Temperature compensated solar cell light sensor
US3928843A (en) * 1974-06-24 1975-12-23 Optical Coating Laboratory Inc Dual channel infrared intrusion alarm system
JPS51141692A (en) * 1975-05-31 1976-12-06 Hamada Kikai Sekkei Jimusho:Kk Lubricating oil deterioration test and instrument therefor
JPS5243674U (de) * 1975-09-23 1977-03-28
JPS5289985U (de) * 1975-12-27 1977-07-05
JPS52106054U (de) * 1976-02-09 1977-08-12
US4438348A (en) * 1978-10-06 1984-03-20 Harris Corporation Temperature compensated avalanche photodiode optical receiver circuit
JPS57192487U (de) * 1981-05-29 1982-12-06
JPS5915733B2 (ja) * 1981-06-24 1984-04-11 東芝機械株式会社 車輛用合金ホイ−ルの製造方法

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Publication number Priority date Publication date Assignee Title
US3231748A (en) * 1961-10-30 1966-01-25 Fyr Fyter Co Smoke detector
US3396387A (en) * 1962-07-24 1968-08-06 Kidde & Co Walter Supervised apparatus for detecting suspended matter in fluids
AT288208B (de) * 1967-04-21 1971-02-25 Pyrotector Inc Überwachungseinrichtung zur Anzeige des Ausfalles der Lichtquelle für lichtoptische Rauchmelder
CH621640A5 (de) * 1977-11-21 1981-02-13 Cerberus Ag
DE3146110A1 (de) * 1980-11-24 1982-06-16 Hekatron GmbH, 7811 Sulzburg "optischer rauchdetektor"
GB2095821A (en) * 1981-03-17 1982-10-06 Malinowski William J Self-calibrating smoke detector and method

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ING.A.RATHEISER UND ANTON F. KECLIK, "Elektron-Taschenbuch fur den Radiopraktiker" 1952 "ELEKTRON"-VERLAG Linz/D. * Page 408, chapter " Grundsätzliches " ; page 412, chapter " c) Störungen über das, Lichtnetz " * *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399786B (de) * 1986-03-18 1995-07-25 Hochiki Co Überwachungsanlage
GB2188725A (en) * 1986-03-18 1987-10-07 Hochiki Co Detecting system and detector
GB2188725B (en) * 1986-03-18 1990-02-28 Hochiki Co Detecting system and detector
FR2596180A1 (fr) * 1986-03-18 1987-09-25 Hochiki Co Systeme de detection de fumees et analogues et detecteur correspondant
WO1988009024A1 (en) * 1987-05-06 1988-11-17 Diantek Ab Temperature compensated detector for sensing and/or measuring passing objects
GB2230853A (en) * 1989-03-23 1990-10-31 Nittan Co Ltd Photoelectric smoke sensor
GB2230853B (en) * 1989-03-23 1993-03-17 Nittan Co Ltd Photoelectric smoke sensor
WO1990016053A1 (en) * 1989-06-15 1990-12-27 Fire Fighting Enterprises (Uk) Limited Particle detectors
GB2242521A (en) * 1989-06-15 1991-10-02 Fire Fighting Enterprises Particle detectors
GB2242521B (en) * 1989-06-15 1993-07-21 Fire Fighting Enterprises Particle detectors
EP0418411A1 (de) * 1989-09-19 1991-03-27 Siemens Aktiengesellschaft Brandmeldeanlage mit einem Kombinationsmelder
EP0463795A1 (de) * 1990-06-23 1992-01-02 Kidde Fire Protection Limited Rauchpartikeldetektor
AU642745B2 (en) * 1990-06-23 1993-10-28 Kidde Ip Holdings Limited Particle detection
US5231378A (en) * 1990-06-23 1993-07-27 Kidde-Graviner Limited Particle detection which senses scattered light
FR2723235A1 (fr) * 1994-07-29 1996-02-02 Lewiner Jacques Dispositifs de detection d'incendie comportant un capteur de correction
WO1996004631A1 (fr) * 1994-07-29 1996-02-15 Jacques Lewiner Dispositif de detection d'incendie avec correction de parametres perturbateurs
EP0987663A1 (de) * 1998-09-14 2000-03-22 Siemens Building Technologies AG Optischer Rauchmelder nach dem Extinktionsprinzip und Verfahren zur Kompensation von dessen Temperaturdrift
US6456379B1 (en) 1998-09-14 2002-09-24 Siemens Building Technologies Ag Optical smoke detector operating in accordance with the extinction principle and method for compensating its temperature drift

Also Published As

Publication number Publication date
KR950002498B1 (ko) 1995-03-20
NZ209184A (en) 1988-07-28
AU3184184A (en) 1985-02-14
KR850001585A (ko) 1985-03-30
DE3480500D1 (en) 1989-12-21
US4665311A (en) 1987-05-12
EP0140502B1 (de) 1989-11-15
JPH0449645B2 (de) 1992-08-12
AU573243B2 (en) 1988-06-02
CA1252172A (en) 1989-04-04
JPS60100022A (ja) 1985-06-03
ATE48044T1 (de) 1989-12-15

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